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Aditi Sharma , D. Tripathi

Abstract

The present study was undertaken to assess the growth performance of 5 year old Acacia catechu tree under resource constraints (nutrient and moisture) in mid-hill condition of Himachal Pradesh. The results revealed that tree responded positively to the application of nutrient and moisture. The application of fertilizer, irrigation and mulch in combination resulted in an increase of 123 and 162 per cent in CAI and biomass production, respetively over control. The per cent increase in foliar macronutrients content - N, P, K, Ca, Mg and S with the application of all resources was recorded to the tune of 26, 79, 12, 13, 17 and 15 per cent over control. However, available nutrients content exhibited a decreasing trend. The application of all resources in combination resulted in substantial build up of available macronutrients, particularly N, P and K. The correlation studies indicated that the sub-surface soil nutrient status is an important factor governing the growth performance and nutrient content of tree species.

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Gopal Krishan , A. R. Bhandari , D. Tripathi

Abstract

Studies were conducted under glasshouse conditions with a total of 7 treatments viz., uninoculated control (UC), UC+N and two rhizobial isolates (ALS-3 and SAM-3) and one mycorrhizal culture (Glomus mosseae) and their combination to record the effect of dual inoculation with Rhizobium + AM on the nursery seedlings of Albizia lebbek. Dual inoculation of Albizia lebbek with Rhizobium + AM improved the shoot and ischolar_main length, leaf area, chlorophyll content, plant biomass, nodulation status, N-uptake, P-uptake, amount of N₂-fixed and ischolar_main colonization over uninoculated control.

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R. C. Sharma , N. B. Singh , D. Tripathi , Anil Sood

Abstract

A survey on the status and distribution of willow mortality in the cold desert of Lahaul and Spiti district of Himachal Pradesh was conducted during 2007. Large scale willow mortality ranging from 2 to 93.8 per cent was recorded in Lahaul sub-division. The extent of mortality was higher in Chandra valley as compared to Pattan and Bhaga valleys. In Spiti sub-division willow mortality was recorded only at Qurith (2%). Investigations revealed that Cytospora canker caused by Cytospora chrysosperma is the major cause of willow mortality. At few places scale insect (Lepidosaphes sp.) infestation was also recorded. Based on the causes of the mortality, a package of recommendations has been suggested to reduce the willow mortality in the cold desert areas.

Keywords

Willow (Salix sp.), Mortality, Cytospora Chrysosperma, Scale Insect, (Lepidosaphes sp.), Cold Desert

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Pardeep Kumar ¹, D. Tripathi ², L. P. Awasthi ², R. K. Jain ³

Affiliations
1 Krishi Vigyan Kendra, Siddharth Nagar (U.P.), IN
2 Department of Plant Pathology, N.D. University of Agriculture and Technology, Kumarganj, Faizabad (U.P.), IN
3 Advance Center of Virology, Indian Agricultural Research Institute, New Delhi, IN

Abstract

Chilli plants showing severe mosaic mottling on foliage and bud necrosis symptoms, were collected from different locations around Faizabad and the causal virus was purified. The purified virus samples reacted only with polyclonal antiserum raised against coat protein (cp) of Tobacco streak virus (TSV) isolate from India (TSV- SF) in direct antigen coated enzyme linked immunosorbent assay. The identity of the causal virus associated with chilli bud necrosis was further confirmed by reverse transcription polymerase chain reaction and sequence analysis. The CP gene was amplified and sequenced. The CP gene was 717 nucleotides long and could encode a protein of 238 amino acids. Comparative amino acid sequence analysis revealed that the virus infected chilli shared maximum identity both at nucleotide (98-99%) and amino acids (98%) levels with the corresponding region of TSV isolates.

Keywords

Chilli, Virus, Isolation, Characterization.

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